Happiness is the very definition of self-made, it's the satisfaction with our lot in life, the achievements we have gained by dint of perspiration and the ability to chose to get back up and smile after life knocks us on our arse. We can chose a life of happiness the problem is most people chose a life of pleasure saturation and pain avoidance.
As for justice it is essentially the punishment side of the coin of reciprocity. Justice is the punishment we would expect meted out to us or a loved one if they harmed someone else. The punishment should also result in a net negatitive benefit to the attacker so that there is no profit in the crime... Including those who don't get caught.
You don't need metaphysics you just need to be fair to one and all.
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